Color.review

Color.review is a contrast checker built around a live preview: you pick text and background colours and it shows the WCAG 2.1 contrast ratio, with the AA and AAA thresholds for body text, large text and interface elements explained alongside. Every combination gets a direct link, so a colour pair can be shared or bookmarked, and the page explains why some hues read better than others. Designers use it to check a palette pair in seconds, and people new to accessibility use it to learn what AA and AAA actually ask for.